People are taking that Kishi drawing too seriously. It's just a sample he drew. It doesn't mean it's going to happen. They share a similar aspect like the manga volume covers. They are just drawing samples.
OT: From the ways i think, tailed beasts are probably not going to exist or are going to get sealed off. Since in the first chapter of Boruto, you can actually see the damage caused by tailed beats on the village. You can see the claw markings on the walls and stuff, which implies that either the beats fought with Kawaki or Kawaki used them to attack the village.